Field-Emission Resonances at Tip/,ω-Mercaptoalkyl Ferrocene/Au Interfaces Studied by STM

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Müller-Meskamp, Lars and Karthäuser, Silvia and Zandvliet, Harold J.W. and Homberger, Melanie and Simon, Ulrich and Waser, Rainer (2009) Field-Emission Resonances at Tip/,ω-Mercaptoalkyl Ferrocene/Au Interfaces Studied by STM. Small, 5 (4). pp. 496-52. ISSN 1613-6829

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Abstract:The electrical properties of ,ω-mercaptoalkyl ferrocenes with different alkyl chain lengths embedded in a self-assembled host matrix of alkanethiols on Au(111) are studied by scanning tunneling microscopy and spectroscopy. Based on current–distance spectroscopy, as well as on the evaluation of Fowler–Nordheim tunneling current oscillations, the apparent barrier height of ferrocene is determined independently by two methods. The electronic coupling of the ferrocene moiety to the Au(111) substrate is shown to depend on the length of the alkane-spacer chain. In a double tunnel junction model our experimental findings are explained, addressing the role of the different molecular moieties of the mercaptoalkyl ferrocenes.
Item Type:Article
Copyright:© 2009 Wiley
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/72780
Official URL:http://dx.doi.org/10.1002/smll.200800802
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